diff --git a/exam_problem2.c b/extra/exam_problem2.c
similarity index 100%
rename from exam_problem2.c
rename to extra/exam_problem2.c
diff --git a/extra/linked.c b/extra/linked.c
new file mode 100644
index 0000000..6db44f6
--- /dev/null
+++ b/extra/linked.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct _list * List;
+
+struct _list
+{
+	int data;
+	List next;
+};
+
+List init(int data) {
+	List new = (List) malloc(sizeof(struct _list));
+	new->next = NULL;
+	new->data = data;
+	return new;
+}
+
+void add(List list, int data) {
+	// List head = list;
+	while(list->next != NULL) {
+		list = list->next;
+	}
+	list->next = (List) malloc(sizeof (struct _list));
+	list->next->next = NULL;
+	list->next->data = data;
+}
+
+void print_list(List list) {
+	while (list) {
+		printf("%d%c", list->data, list->next == NULL ? '\n' : ' ');
+		list = list->next;
+	}
+}
+
+int main(int argc, char const *argv[])
+{
+	List l = init(1);
+	add(l, 2);
+	add(l, 3);
+	add(l, 4);
+	add(l, 5);
+	print_list(l);
+	return 0;
+}
\ No newline at end of file
diff --git a/extra/numbers.txt b/extra/numbers.txt
new file mode 100644
index 0000000..87a4334
Binary files /dev/null and b/extra/numbers.txt differ
diff --git a/extra/strings.c b/extra/strings.c
new file mode 100644
index 0000000..85bd237
--- /dev/null
+++ b/extra/strings.c
@@ -0,0 +1,87 @@
+/*
+ ============================================================================
+ Name        : test.c
+ Author      : Denis
+ Version     :
+ Copyright   : Your copyright notice
+ Description : Hello World in C, Ansi-style
+ ============================================================================
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int len(char const * string) {
+	int i = 0;
+	while(*string) {
+		i++;
+		string++;
+	}
+	return i;
+}
+
+void swap(char * a, char * b) {
+	int temp = *a;
+	*a = *b;
+	*b = temp;
+}
+
+
+char const *find_char( char const *source, char const *chars ) {
+	while (*chars) {
+		for (char const * i = source; *i; ++i) {
+			if ( *chars == *i) {
+				return i;
+			}
+		}
+		++chars;
+	}
+	return NULL;
+}
+
+int del_substr( char *str, char const *substr ) {
+	int is_in_string  = 0;
+	int substr_len    = len(substr);
+	int length        = 0;
+	int index         = 0;
+	for (int i = 0; str[i]; ++i) {
+		length = 0;
+		while ( str[i + length] == substr[length] ) {
+			++length;
+			if( !substr[length] ) {
+				index = i;
+				is_in_string = 1;
+				goto exit_loop;
+			}
+		}
+	}
+	exit_loop:
+	if ( is_in_string ) {
+		int counter;
+		for (counter = 0; str[index + length + counter]; ++counter) {
+			str[index + counter] = str[index + length + counter];
+		}
+		str[index + counter] = '\0';
+	}
+	return is_in_string;
+}
+
+
+void reverse_string(char * string) {
+	int size = len(string) - 1;
+	for (int i = 0; i < size / 2; i++) {
+		swap(string + i, string + size - i);
+	}
+}
+
+int main(void) {
+	char ana[] = "Ana areare mere.";
+	//reverse_string(ana);
+	printf("%s", ana);
+	printf("\n");
+	//printf("%s", find_char(ana, "era") );
+	printf("\n");
+	int x = del_substr(ana, "are");
+	printf(" %d %s", x, ana);
+	return EXIT_SUCCESS;
+}
diff --git a/lab06/l6_2.c b/lab06/l6_2.c
index 8ce2e6f..92d551f 100644
--- a/lab06/l6_2.c
+++ b/lab06/l6_2.c
@@ -89,7 +89,7 @@ void area_rectangle(struct gshape *gs) {
   double length = gs->gshape.rectangle.x4 - gs->gshape.rectangle.x1;
   double width = gs->gshape.rectangle.y4 - gs->gshape.rectangle.x4;
   printf("AREA OF RECTANGLE #%d IS: %g\n", gs->ID, fabs(length*width) );
-}
+}                   
 
 int main() {
   int i, type;